In this paper, the research status of risk assessment method has been analyzed for civil aircraft operating. The method ofprobabilistic risk assessment inaircraft has been established based on the FMEA and FTA. Three type methods have been presented to calculate the fleet risk: The probability forecast of fleet has been developed by maintenance plan and historical data. The fleet risk model has been established at random failures period.Uncorrected fleet risk assessment method andthe case have been establishedat wear-out period. The fleet risk trends, influencing factors as well as risk value may occur have been given.Compared withfour methods, the suitable operation risk methods for civil aircraft and fleet have been established in variable states over the remaining life of the fleet. Through these methods, the risk of civil aircraft would be reduced effectively during operation.